Objective To study the effect of family background factors on mental health in college graduates.Methods Totally 11 219 undergraduates were investigated with SCL-90 and self-compiled family background questionnaire,then the acquired data were analyzed.Results There were significant differences in factor scores of SCL-90 among students whose family incomes per month were different,who come from different areas of countryside or city,whose family structures and atmospheres were different (P〈0.05),except for the scores of hostility and affright...